Asbestos is the name of a group of minerals that are made up of bundles of tiny fibers composed of hydrated magnesium silicates. It is mined from the ground. Asbestos has been widely used in building and manufacturing industries because it is not affected by heat or chemicals.
Asbestosis is a lung condition caused by breathing in asbestos fibers. Usually, when particles in the air are breathed in, they are filtered out by the nose or the upper airways of the lungs. But asbestos particles are very thin and light, and sometimes are not filtered out before they reach the lungs. After years of exposure, asbestos can damage lung tissue and is responsible for causing several serious diseases, including cancer. Mesothelioma is a specific type of cancer that is caused by inhaling asbestos particles.


Asbestosis is caused when the fibers are inhaled deep into the lungs. Here they are trapped in tiny airways where they cause scarring, called fibrosis, to the lung tissue. Repeated or continuous exposure over a long time can cause scarring over large areas of the lungs. When this happens, lungs lose their elasticity. When lungs can’t expand and contract normally, a person will experience shortness of breath. Scarring also decreases the ability of the lungs to do their work of exchanging oxygen and carbon dioxide.
Thickening and Fibrosis of Lung Tissue
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Risk Factors

A risk factor is something that increases your chance of getting a disease or condition. Asbestosis primarily affects people who are regularly exposed to asbestos. The more a person is exposed, the greater the risk of developing an asbestos-related disease. However, most people who have had prolonged exposure to asbestos do not develop asbestosis. Those at highest risk are:


Asbestosis takes a long time to develop. The earliest symptoms usually show up 10-40 years after first exposure. The disease can develop even when exposure to asbestos ended years before. The severity of the disease depends on the amount and length of time of exposure to asbestos. Symptoms get worse as the disease progresses and may include:
Other symptoms may include:


The diagnosis is made based on:
Tests used in diagnosis of asbestosis:


There is no treatment to cure asbestosis, and the disease slowly worsens. The first and most important changes a person can make are the following:
Once the condition is diagnosed, treatment involves staying healthy and treating the symptoms. These measures include:


Since the 1970s, asbestos use and handling has been increasingly controlled by the government. Asbestosis can be prevented by controlling the asbestos dust and fibers in the workplace. In addition, people who handle asbestos at work must shower and change their clothes before leaving work. As a result of these measures, fewer people develop the disease.
People who need to have asbestos removed from their house should seek help from professionals trained in asbestos removal.
It is also important to note that smoking increases the attack and/or progression rate of asbestosis.


American Cancer Society

Occupational Safety and Health Administration


Canadian Centre for Occupational Health and Safety

The Lung Association


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Asbestos exposure and cancer risk. National Cancer Institute website. Available at: Updated May 1, 2009. Accessed May 4, 2016.

Asbestos: Health effects of exposure to asbestos. Agency for Toxic Substances and Disease Registry (ATSDR) website. Available at: Updated April 1, 2008. Accessed May 4, 2016.

Becklake MR, et al. Asbestos-related diseases of the lungs and pleura: Uses, trends and management over the last century. Int J Tuberc Lung Dis 2007;11(4):356-69. O’Reilly KM, Mclaughlin AM, et al. Asbestos-related lung disease. Am Fam Physician. 2007;75(5):683-638.

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